Analysis of seven-times-ionized barium: BaVIII

The spectrum of barium was recorded in the 250-1240-Angstrom region on a va riety of spectrographs. The sources used were a conventional triggered spar k and a laser-produced plasma. The spectrum of seven-times ionized barium w as investigated. Eight of thirteen levels reported earlier were confirmed. In the present analysis we have established a total of 74 levels, 66 of the m new, belonging to the 5s(2)5p, 5s(2)4f, 5p(3), 5s5p5d, 5s(2)6p, 5s(2)5f, and 5s5p6s configurations in the odd-parity system and to the 5s5p(2), 5s(2 )5d, 5s5p4f, and 5s(2)6s configurations in the even-parity system. We carri ed out least-squares fitted and Hartree-Fock calculations to interpret the spectrum satisfactorily. One hundred thirty-nine lines have been classified in this spectrum, of which one hundred thirty are newly classified lines. (C) 2000 Optical Society of America.